<template>
    <div class="home-page">
        <div class="banner">
            <div class="container">
                <h1 class="logo-font">Test</h1>
                <p>A place to share your knowledge.</p>
            </div>
        </div>

        <div class="container page">
            <div class="row">
                <div class="col-md-9">
                    <div class="feed-toggle">
                        <ul class="nav nav-pills outline-active">
                            <li class="nav-item" v-if="user">
                                <nuxt-link
                                    class="nav-link"
                                    :to="{
                                        name: 'home',
                                        query: {
                                            tab: 'your_feed',
                                        },
                                    }"
                                    exact
                                    :class="{
                                        active: tab === 'your_feed',
                                    }"
                                    >Your Feed</nuxt-link
                                >
                            </li>
                            <li class="nav-item">
                                <nuxt-link
                                    class="nav-link"
                                    :to="{
                                        name: 'home',
                                        query: {
                                            tab: 'global_feed',
                                        },
                                    }"
                                    exact
                                    :class="{
                                        active: tab === 'global_feed',
                                    }"
                                    >Global Feed</nuxt-link
                                >
                            </li>
                            <li class="nav-item" v-if="tag">
                                <nuxt-link
                                    class="nav-link"
                                    :to="{
                                        name: 'home',
                                        query: {
                                            tab: 'tag',
                                            tag: tag,
                                        },
                                    }"
                                    exact
                                    :class="{
                                        active: tab === 'tag',
                                    }"
                                    ># {{ tag }}</nuxt-link
                                >
                            </li>
                        </ul>
                    </div>

                    <div
                        class="article-preview"
                        v-for="article in articles"
                        :key="article.slug"
                    >
                        <div class="article-meta">
                            <nuxt-link
                                :to="{
                                    name: 'profile',
                                    params: {
                                        username: article.author.username,
                                    },
                                }"
                            >
                                <img :src="article.author.image" />
                            </nuxt-link>
                            <div class="info">
                                <nuxt-link
                                    :to="{
                                        name: 'profile',
                                        params: {
                                            username: article.author.username,
                                        },
                                    }"
                                    class="author"
                                >
                                    {{ article.author.username }}
                                    />
                                </nuxt-link>
                                <span class="date">
                                    {{
                                        article.createdAt | date("MMM DD, YYYY")
                                    }}</span
                                >
                            </div>
                            <button
                                class="btn btn-outline-primary btn-sm pull-xs-right"
                                :class="{
                                    active: article.favorited,
                                }"
                                @click="onFavorite(article)"
                                :disabled="article.favoritedDisabled"
                            >
                                <i class="ion-heart"></i>
                                {{ article.favoritesCount }}
                            </button>
                        </div>
                        <nuxt-link
                            :to="{
                                name: 'article',
                                params: {
                                    slug: article.slug,
                                },
                            }"
                            class="preview-link"
                        >
                            <h1>{{ article.title }}</h1>
                            <p>{{ article.description }}</p>
                            <span>Read more...</span>
                        </nuxt-link>
                    </div>

                    <!-- 分页 -->
                    <nav>
                        <ul class="pagination">
                            <li
                                class="page-item"
                                v-for="item in totalPage"
                                :key="item"
                                :class="{
                                    active: item === page,
                                }"
                            >
                                <nuxt-link
                                    class="page-link"
                                    :to="{
                                        name: 'home',
                                        query: {
                                            page: item,
                                            tag: $route.query.tag,
                                            tab: tab,
                                        },
                                    }"
                                >
                                    {{ item }}
                                </nuxt-link>
                            </li>
                        </ul>
                    </nav>
                    <!-- 分页 -->
                </div>

                <div class="col-md-3">
                    <div class="sidebar">
                        <p>Popular Tags</p>

                        <div class="tag-list">
                            <nuxt-link
                                v-for="tag in tags"
                                :key="tag"
                                :to="{
                                    name: 'home',
                                    query: {
                                        tag: tag,
                                        tab: 'tag',
                                    },
                                }"
                                class="tag-pill tag-default"
                            >
                                {{ tag }}
                            </nuxt-link>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import {
    getArticles,
    getFeedArticles,
    deleteFavorite,
    addFavorite,
} from "@/api/article";
import { getTags } from "@/api/tag";
import { mapState } from "vuex";
export default {
    name: "HomeIndex",
    async asyncData({ query, store }) {
        const page = Number.parseInt(query.page) || 1;
        const limit = 20;
        const { tag } = query;
        const tab = query.tab || "global_feed";
        const loadArticles =
            store.state.user && tab === "your_feed"
                ? getFeedArticles
                : getArticles;
        const [articleRes, tagRes] = await Promise.all([
            loadArticles({
                limit: limit,
                offset: (page - 1) * limit,
                tag,
            }),
            getTags(),
        ]);
        const { articles, articlesCount } = articleRes.data;
        const { tags } = tagRes.data;

        articles.forEach((article) => (article.favoritedDisabled = false));

        return {
            articles,
            articlesCount,
            tags,
            page,
            limit,
            tag,
            tab,
        };
    },
    watchQuery: ["page", "tag", "tab"],
    computed: {
        ...mapState(["user"]),
        totalPage() {
            return Math.ceil(this.articlesCount / this.limit);
        },
    },
    methods: {
        async onFavorite(article) {
            article.favoritedDisabled = true;
            if (article.favorited) {
                // 取消点赞
                await deleteFavorite(article.slug);
                article.favorited = false;
                article.favoritesCount += -1;
            } else {
                // 添加点赞
                await addFavorite(article.slug);
                article.favorited = true;
                article.favoritesCount += 1;
            }
            article.favoritedDisabled = false;
        },
    },
};
</script>

<style></style>
